You can find a copy of the owner's manual here - http://stevespages.com/pdf/jennings_380.pdf
Best left to a gunsmith
Best left to a gunsmith
Best left to a gunsmith
Let a gunsmith do it.
Take it to a gunsmith and ask for help
Take it to a gunsmith and ask for help
Ask a gunsmith to show you.
Best advice is to find a gunsmith and ask for help
Find a gunsmith and ask for help
200 bucks
At that level of detail, your best bet is to find a good gunsmith.
If you don't have an owner's manual, go to a gunsmith